Solution: Hue lights that I can control from Alexa. If I'm dozing off while reading on the couch before bed, I can turn the lights off without having to wake up enough to actually go reach a switch.
All my locks are normal locks that use normal keys (although they are actually called "SmartKey" locks, but that just refers to the clever way they can be rekeyed [1], which is entirely mechanical). I have considered getting one smart lock that has voice and app control because I live alone.
The idea there is that if I have a medical emergency that incapacitates me so that I cannot unlock a door but doesn't incapacitate me so much that I can't call 911, I can unlock a door so when the ambulance arrives they don't have to break in to get me.
[1] The way you rekey them is you put in your current key, turn 90 degrees clockwise, insert a tool they provide into a hole that is next to the keyway to press a release in the back of the hole, remove that tool, and you can then remove the current key (carefully leaving the cylinder rotated 90 degrees). At that point you can put a different key in, and then turn the cylinder 180 degrees counterclockwise. The lock is now keyed to that key instead of the key you started with.